Rotary draw works with adjustable jack shaft



E. w. GOESER 1,899,953

ROTARY DRAW WORKS WITH ADJUSTABLE JACK SHAFT I March 7, 1933.

Filed May 14, 1928 2 Sheets-Sheet l :47'TOE/VEX' March 7, 1933. E. w.GOESER ROTARY DRAW WORKS WITH ADJUSTABLE JACK SHAFT Filed May 14, 1928 W1 %w r/ L Rh m w .5 m WW Ms a m w u n i\ v M E I F W M x x F R M 5 E: m-I Patented Mar. 7, 1933 STAT-ES EDWIN cons-ER, or LOS AnGEnns,CALIFORNIA, Assrenon 'ro nmsco nnnmcx &

EQUIPMENT COMPANY, or LOS,.|A1\TGELES,GALIF0RNIIA, A coRroR rrIon orCALI- ROTARY DRAW WORKS WITH- ADJ .USTABLEIJAGK, SHAFT Application filedMay 14,

This inventionconsists iofla novel means for adjusting. the :position ofasprocket .or a pair of. sprockets .or their equivalents, so

that the endless member or members which extend around the sprocketsorsprockets. may have the proper tension. My invention is notonly'combinatively new in' its entirety, but the combination ofcertainpartsis new.

My invention has a particularntility on rotary draw works used'inthe.oil well dri1lingindustry,and in view of this I choose to illustrate myinvention embodied in a rotary draw works. p

In'order that the utility and advantages of my invention may be fully.appreciated, I

' shall briefly refer to the oilwelldrillingindustry. The rotary drawworks is mounted at one side of the derrick floor, and has a line shaftby which the spooling drum is driven. The type of draw works in which myinvention is incorporatedhas a jack shaft which is mounted nearthederrick floor below the line shaft. The line shaft' operates the jackshaft by means of a sprocket and chain connection. The rotarytableywhich is situated near the center of the. derrick floor, isdrivenby means of avsprocket and chain connection with the jack shaft.For

best operating results the .chains'should be draw works 10emb0dying myinventionincludes" a frame having uprights 11,12, ,and

It is another object of this invention, to provide an adjustment meanswhereby a shaft may be repositioned by beingmoved in two directions inplanes at-right angles to .theYaXis of the'shaft.

By incorporating this feature in the jack shaft of the rotarydraw works,it' is possible to adjust the tension on either or both of the chainsassociated therewith by repositioning the ack shaft.

A further object of this invention is" to 1 928. Serial No. 327, 44.,

provide an. adjustment means for a shaft,

the shaft "being non-rotatable .and 'rotatably supporting a pair ofsprockets or their equivalent;'

, Ajstill' further'obj-ect of my invention is to provideacombinationwhichincludes a Fig. 3 is an enlargedandverticalcrosssectional view taken on the line 33 of Fig. 1'. V v

Fig. 4 is a cross-sectional view taken on thelinelofFig. 3.

Fig. 5 is a section showingjthe jack shaft assembly in section. 2

Referring specifically to the drawings, the

18, which extend betweenan anchor-base 15 and a headboard 16 of aderrick, only a por tion ofwhich derrick is shown. This derrick formspart of a rotary drilling rigsuch as is draw works 10 has a combinedspooling and braking drum 2() rigidly mounted upon a rotatable shaft 21which'journals in suitable bearings provided on uprightsll and 12.

at rightanglesto the axis of the adapted for use in drilling anoilwell.The L Rotat'ably mountedfonthe shaft: 21 are sprockets 22, 23, and '24,any one of which is adaptedto bev nonqrotatably; locked-to the shaft 21.by suitable clutchmechani'sms. Extendingacrossthe draw works 10 abovethe spooling and braking drum 20, andijournaled in suitable bearingsprovided upon uprights 11, 12, and13, is a line shaft 25, which isadapted to be. rotated by a sprocket .26 V driven through a suitablesprocket chain. from a holes 60, is a plurality of shims 63. '50

i pair of clamp means or caps65. 55

steam engine or other source of power. Sprocket pinions 27, 28, and 29are nonrotatably mounted on the line shaft 25 and are connected bysprocket chains to the sprockets 22, 23, and 24 respectively so thatwhen any one of the latter three sprockets is non-rotatably connected tothe shaft 21, this shaft and the spooling and braking drum 20 arerotated by the line shaft25. The different ratios between the diametersof the connected sprockets mentioned above make it possible to drive theshaft 21 by the shaft 25 at any one of three speed ratios.

Provided on opposite-ends of the line shaft 25 are catheads and 86,which are normally disposed at aboutthe height of a mans head and areprovided for drawing in upon a rope, loosely wound about one of thesecatheads by one. of the workers. Rotatably mounted on the line shaft 25,between the sprocket 29 and the upright 13, is a drive sprocket 40 whichis adapted to be non-rotatably connected by a clutch 41 to the lineshaft 25'by the operation of a suitable controlling mechanism 42.

Constructed on the anchor base 15 is a derrick floor 45 and disposedparallel with and close to this floor is a jack shaft 46, the

opposite ends of which are supported in brackets 47 and 48 mounted onthe lower ends ofuprights 12 and 13 respectively. The ack shaft 46 iscylindrical and is provided with end portions 49, each having a flatlower face 50. The jack shaft end portions extend across and aresupported by the brackets 47 and 48. Each of these brackets'includes abase member which is connected by bolts 56 to one of the uprights 12 and13. The

. base 55 extends outwardly and downwardly 40 to provide a clamp j aw 57having a recess 58 which opens upwardly. The opposite side faces 59 and60 of the recess 58 are preferably parallel to each other and thisrecess is open at both ends, as clearly shown in Fig. 4. Suitable holes60 are provided in the jaw 57 for a purpose to be described later.

Resting in the recess 58 and supporting a plate 62, which has aperturesaligned with The end portions 49 of the jack shaft 46 rest upon thecentral portion of the plates 62. Fitting over the end portions 49 ofthe jack shaft 46 are cavities 64 eccentrically provided in a The caps65 have holes 66 which are aligned with the apertures in the plates 62and with the holes 60 so that bolts 68 may extend upwardly through theholes 60, through the plates 62 and the holes 66, and bind the caps 65against vthejack shaftends 49 soas to rigidly positionthe jack shaft 46upon the "brackets 47 i and 48.

As will be noted in Fig. 3, the eccentric cavities 64 are so formed thatwhen the caps 65 are removed, turned 180 on a vertical axis,

and replaced over the jack shaft ends 49, the caps 65 are in thepositions indicated by broken lines 70 in Fig. 3. This causes the jackshaft 46 to be moved a slight distance toward the uprights 12 and 13.Likewise, by loosening the bolts 68, some of the shims 63 may be removedor additional shims inserted between the jaws 57 and the plates 62 sothat when the bolts 68 are again tightened, the jack shaft 46 will be agreater or less distance than previously from the line shaft 25. a

Rotatably mounted on the jack shaft 46 is a jack shaft sprocket member72 having a driven sprocket 7 3 and a drive sprocket 74. The jack shaftsprocket member is supported by a bearing-71. The driven sprocket 7 3 isin alignment with the sprocket 40 and connected thereto by a suitablesprocket chain 75.

Mounted in the center of the derrick floor 45 isa rotary table'7 8,which'is adapted for rotating a drill pipe extending into the Well. Therotary table 7 8'is adapted to be driven by rotation of a shaft 79provided with a pinion sprocket 80. The sprocket 80 is in alignment withthe drive sprocket 74 of the draw works 10 and a sprocket chain 81extendsaround and connects these sprockets.

The feature of my invention, as previously pointed out, is the adjustingmeans. In the present embodiment the tension of the chain 81 is adjustedby reversing the position of the caps 65 which moves the jack shaft 46.and the sprocket member 72 away from thesproc-ket 80. The tension of thechain is adjusted by removing or inserting shims 63 which lowers orraises the jack shaft 46 and'the sprocket member 72.

I claim as my invention:

1. In a rotary draw works the combination of: a plurality of uprightframe members; a line shaft rotatably mounted on upper portions ofsaidmembers; a jack shaft; a drive sprocket on said jack shaft adapted to beconnected by a sprocket chain with a rotary table for driving the same;means for driving said drive sprocket from saidline shaft; bracketsprovided upon lower portions of said iiprigh ts and adapted to supportsaid i jack shaft, each of said bracketsv having an upwardly openingrecess across which an end of said jack shaft extends; positioning meansapplicable to said jack shaft ends and fitting into said recesses ofsaid brackets in A a plurality of positions to vary the distance betweensaid jack shaft and said rotary table, the distance between said jackshaft and said line shaft, or both of said distances; and

means for securing said positioning means to c said brackets. V

2. In combination: a first shaft; a second shaft; a third shaft; a firstdrive means associated' with said first and third shafts; a second drivemeans associated with said second and third shafts; a base; a cap havinga non-central cavity in which said tliird shaft rests; means forsecuring said cap to said base in a normal or reverse position, thusrendering said cap and said third shaft adjustable toward or from one ofthe other shafts; and shim means whereby said cap and said third shaftmay be moved toward or from said base, thus giving an adjustment betweensaid I third shaft and the other of said first and second shafts.

3. In a rotary draw works the combination of: a plurality of uprightframe members; a line shaft rotatably mounted on upper portions of saidmembers; a jack shaft; a drive sprocket on said jack shaft adapted to beconnected by a sprocket chain with a rotary table for driving the same;means for driving said drive sprocket from said line shaft; bracketsprovided upon lower portions of said uprights and adapted to supportsaid jack shaft; and means for mounting said jack shaft on saidbrackets, said mounting means being shiftable on said brackets to varythe distance of said drive sprocket from said rotary table, the distancebetween said jack shaft and said line shaft, or bothof said distances,and in which each of said brackets has a recess opening upwardly andacross which an end of said ack shaft extends, said mounting meansincluding clamp members, one of which is adapted to fit into each ofsaid recesses and to be thereby held against lateral movement, each ofsaid clamp members having an offset cavity fitting said ack shaft, saidcavity changing its location relative to the bracket supporting thatclamp member when said member is changed from one to another of aplurality of positions in which it fits into the recess in that bracket.

In testimony whereof, I have hereunto set my hand at Los Angeles,California, this 4th day of May, 1928.

EDWIN W. GOESER.

